Gravity signal-bell.



PATENTED JAN. 2l, 1908.-

J. MaK, CHAMBERS. GRAVITY SIGNAL BELL.

APPLICATION FILED AUG. 9, 1906.

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UNITED STATES PATENT oEEioE.

JAMES MCKINNON CHAMBERS, OF BOULDER, COLORADO, ASSIGNOR OF ONE-HALF TOMOSES MEYER, OF BOULDER, COLORADO.

GRAVITY SIGNAL-BELL.

Specification of Letters Patent.

Patented Jan. 21, 1908.

Application filed August 9| 1906. Serial No. 329-864.

' and a resident of the city of Boulder, in the county of Boulder andState of Colorado, have invented a new and Improved Gravity Signal-Bell,of which the following is a full, clear, and exact description.

My invention relates to signal bells and more specifically to bells ofthis type which are adapted to be located at a distance from theoperator. l

The objects of my invention are to provide a bell which is positivelyoperated and in which it will be impossible for the operator to soundthe bell more than once upon each releasing of its hammer.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in allfthe iigures.

Figure 1 is a view in elevation showing my device complete; Fig, 2 is asectional view taken on the line 2 2 of Fig. 1- and Fig. 3 is adetailsection taken on the line 3-3 of Fig. 1.

Referring to the drawings, 1 is a support upon which my device ismounted and by means of which it is secured in any desired position.

2 is a pull rod and 3 a counterweight rod. These rods are joined bymeans of a screw threaded connection with a coupling sleeve 4, which isfirmly held in iiXed position upon said rods by set screws 5, 5. Saidcoupling sleeve carries a tappet 6 for a purpose presently to bedescribed. The rods 2 and 3 are squared and movable respectively inbearings 7 and 8, located on each side of the coupling sleeve. The innerends of the bearings actas stops for the coupling sleeve 4, thuslimiting the motion of said sleeve in either direction.

9 is a pull rope attached at one end to the pull rod 2 leading to somepoint convenient to the operator.

10 is a rope connecting the rod 3 with a counterweight 10a, of anysuitable size and the amount of which may be varied to suit theconvenience of the operator.

11, 11a are two pulleys over which the rope 10 passes, although it isevident that bell crank levers may be used in place of the pulleys, ifdesired.

The tappet 6 engages a pawl 12, pivoted at 13 to a hammer-arm 14, whichis pivoted at 15 to the support 1 and carries a hammer 16 on the endthereof opposite to that on which the pawl 12 is pivoted. The pawl 12has a shoulder 17 on one side of its pivot which is adapted, when thetappet is pulled by the operator into contact with said pawl, to engagea corresponding shoulder 18 on the end of the hammer-arm. A portion ofthe pawl, on the opposite side of its pivot from the shoulder 17, is cutaway in such a manner as to allow the pawl, when engaged by the tappeton its return movement, to tilt, and thus allow the tappet to pass by,preparatory to a further movement in the opposite direction. Thediiferent positions assumed by the pawl are clearly shown by the dottedlines in Fig. 1, as well as the normal position of the hammerarm.

19 is a cushion which receives the blow of the hammer-arm and holds thehammeraway from the gong, except when the full blow is struck, at whichtime the force of the falling hammer overcomes the elasticity of thecushion. This insures a positive single tap on the gong.

20 is a second stop, which preventsthe hammer-arm from turning too farin a direction away from the gong, which it would otherwise tend to doif the operator should give the pull-rope a very violent jerk.

The gong is represented by the numeral 21 and is secured to the support1 in a position to be engaged by the hammer.

The parts are all mounted in the relative positions shown in Fig. 1, andthe force of the stroke of the bell is always the same as it isdependent solely on gravity. The pulling of the rope merely lifts thehammer and allows it to drop, so that the violence or speed with whichthe rope is pulled does not vary the stroke of the hammer.

From the foregoing description the operation will be obvious and furtherdetailed statement thereof is deemed to be unnecessarv.

Although I have illustrated and described but one embodiment of myinvention, it will be obvious that the latter is not strictly limited tothe details thereof.

I-Iaving thus described my invention, I claim as new' and desire tosecure by Letters Patent:

1. A signal bell, comprising a support, vertically alined bearings onthe support, a rod slidable in each bearing, said rods being polygonalin cross section, and itting 4correlsponding openings in the bearings, asleeve releasably connected With the adjacent ends of the rods, acounterbalance connected with the free end of the upper rod, a pull ropeconnected with the free end of the lower rod, a gong on the supportabove the gong, a normally horizontal arm pivoted to the support andprovided with a hammer for cooperating therewith, a resilient supportfor engaging the arm adjacent to the hammer whereby to normally retainthe hammer out of engagement with the gong, a pawl hinged to theopposite end of the arm from the hammer, said arm end andl pawl beingprovided with coperating shoulders on the lower side of their pivotalconnection for limiting their relative movement in a downward direction,said sleeve being provided with a tappet for engaging the paWl wherebyto swing the hammer arm, and a resilient cushion for limiting the upwardswing of the arm.

2. A signal bell comprising a support, vertically alined bearings on thesupport, a rod slidable in each bearing, said rods being po- Y lygonalin cross section and fitting corresponding openings in the bearings, asleeve provided with a tappet releasably connected with the adjacentends of the rods, a counterbalance connected with the free end of theupper rod, a pull rope connected with the free end of the lower rod, agong on the support, a normally horizontal arm pivoted to the supportabove the gong and provided with a hammer for coperating therewith, aresilient support for engaging the arm adj acent to the hammer wherebyto normally retain the hammer out of engagement with the support, meanswhereby the tappet will swing the arm on the down stroke of the sleeve,and a resilient cushion for limiting the upward swing of the arm.

In testimonywhereoi I have signed my name to this specification in thepresence of two subscribing witnesses.

- JAMES-lllCKINNON CHAMBERS. Witnesses:

C. J. SMITH, E. WoLvERToN.

